Just spent 6 days at Dover speedway in no shade 90 plus weather.
We have an on-board Onan 5500 and this year I also brought along the Honda 3000.
The Honda is a bit more efficient when you can get by with less energy demand, plus it puts the added heat load to the rear of the trailer, not under the bedroom.
The Honda will run one AC, the converter and fridge without too much of an issue. But adding a standalone ice maker will make it choke, as well as one of the Dometic cooler,fridge, freezer unit. Switching the cooler to 12 volts solved that issue.
The Cyclone uses a gasoline generator which is less expensive to run, and separates your fuel supply.
The Cyclone fuel cell is a pain to add gasoline to from a can because the filler is so low.
This year I picked up a 14 gallon tote from Tractor Supply (really holds about 13 gallons)
http://www.tractorsupply.com/en/store/scepter-duramax-flo-n-go-14-gal-cap
That made mid trip re-fueling much easier. Made some changes to that tote.
1st, removed the handle lock. The handle is a pump but the trigger lock was a real PITA.
2nd, I made up a gravity hose. With the tote sitting on the tail gate I let gravity do the pumping. I would not want to pump 13 gallons with the included squeeze pump.
The on board Onan will run 2 AC's, water heater and everything else with no problem.
FYI, the converter on Cyclones (80 amp compared to standard of 50) can draw as much as 11-12 amps when working.